Some XMI exporters do not explicitly specify the owner of an element
using the appropriate XMI element (e.g., a link from an operation back
to the class to which it belongs). Instead, ownership is implied: the
owner is the parent element in the XMI tree. Therefore, when the
trigger(s) for attribute "context" retrieve no information for a model
element, SDMetrics inserts the parent element in the XMI tree as the
owner of the element.